Andrzej Pliś (March 17, 1929[1] – November 28, 1991[2]) was a Polish mathematician, specializing in differential equations and optimal control theory.
[3] He received his PhD from the Mathematical Institute of the Polish Academy of Sciences, where his thesis advisor was Tadeusz Ważewski.
[4] Pliś did research and taught at both the Jagiellonian University and the Mathematical Institute of the Polish Academy of Sciences.
[6][7] His paper Characteristics of nonlinear partial differential equations (1954) gave an elegant solution to an unsolved problem which Alfréd Haar worked on in 1929.
[3] Another noteworthy paper by Pliś is On a topological method for studying the behaviour of the integrals of ordinary differential equations (1954).